Windows 10: Mysterious drive Z: appears! Solved

  1.    15 Jan 2017 #1

    Mysterious drive Z: appears!

    Hello every one, have a good day!
    Here i come with my recent problem as in thread title.

    Recently i found a Z: drive that i cannot acces or modify it in any way.
    Here is some data that i gathered:

    DISKPART> detail disk
    Hitachi HTS541010A9E680
    Disk ID: {C0F04480-1D8C-4C58-B5F0-FFA6AEEAD2BB}
    Type   : RAID
    Status : Online
    Path   : 4
    Target : 0
    LUN ID : 0
    Location Path : PCIROOT(0)#PCI(1F02)#RAID(P04T00L00)
    Current Read-only State : No
    Read-only  : No
    Boot Disk  : No
    Pagefile Disk  : No
    Hibernation File Disk  : No
    Crashdump Disk  : No
    Clustered Disk  : No
      Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
      ----------  ---  -----------  -----  ----------  -------  ---------  --------
      Volume 1     D                NTFS   Partition     90 GB  Healthy
      Volume 2     E   APPS         NTFS   Partition    195 GB  Healthy
      Volume 3     F   DATA         NTFS   Partition    644 GB  Healthy
      Volume 4         Odzyskiwani  NTFS   Partition    300 MB  Healthy    Hidden
    * Volume 5     Z                FAT32  Partition    100 MB  Healthy    System
    Microsoft Windows [Version 10.0.14393]
    (c) 2016 Microsoft Corporation. All rights reserved.
    C:\Windows\system32>takeown /F Z:\ /A /R /D Y
    ERROR: The parameter is incorrect.
    Click image for larger version. 

Name:	2017-01-15 12_29_24-Local Disk (Z_) Properties.png 
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ID:	117208Click image for larger version. 

Name:	2017-01-15 12_39_39-Disk Management.png 
Views:	5 
Size:	169.6 KB 
ID:	117209
    there is no security tab available neither that drive is listed in diskmgmt.msc.

    Please help me to explain what this bizzare creation is and how to get rid of it.
      My ComputerSystem Spec

  2.    15 Jan 2017 #2

    Welcome to the forum that is the boot drive for your UEFI drive you should in assign the drive letter and don't touch it in any way or you won't boot it's normal but should be hidden
      My ComputerSystem Spec

  3.    15 Jan 2017 #3

    Ok, found this much since posted:
    Click image for larger version. 

Name:	2017-01-15 13_10_10-Process Monitor - Sysinternals_ 
Views:	10 
Size:	162.6 KB 
ID:	117214
    Any ideas how come it suddenly appeared?
    What can I do to make it genuine hidden again?
      My ComputerSystem Spec

  4. Posts : 77
    Windows 7 Ultimate 32bit
       15 Jan 2017 #4

    HP Support Assistant creates this Z drive and it appears whenever I run "Check for updates and messages" It disappears after a restart. Nothing to worry about and lose sleep on it.
      My ComputerSystem Spec

  5. Posts : 77
    Windows 7 Ultimate 32bit
       16 Jan 2017 #5

    Continuing on the mysterious Z drive, it is found the HP Support Assistant gives the drive letter Z to the 260 MB EFI System Partition

    AOMEI Backupper when No Z drive is created

    Click image for larger version. 

Name:	EFISytem.JPG 
Views:	5 
Size:	51.2 KB 
ID:	117384

    AOMEI Backupper after HP Support Assistant created Z drive during the check for updates process. Note the 260MB EFI System Partition is now the Z drive.

    Click image for larger version. 

Name:	Zdrive.JPG 
Views:	5 
Size:	52.9 KB 
ID:	117385

    It is also noted that when the Z drive is present Device Manager shows 8 WAN Miniports under Network Adapters.

    Click image for larger version. 

Name:	WANMiniport.JPG 
Views:	5 
Size:	63.0 KB 
ID:	117387

    Though there has been many queries on this Z drive in HP Support forum there is no official explanation on this. Some of the explanations given by HP Support Agents are found ridiculous.

    Whatever, it is now proved beyond doubt that it is the EFI System Partition that takes on the Z drive letter and therefore no attempt should be made to delete it.

    On my system, after closing the HP Support Assistant and restarting the notebook, the Z drive vanishes. This has been consistent.

    However one should take care not to give drive letter Z to any mapped drive or any partition created that would clash with the Z drive created by HPSA.
      My ComputerSystem Spec


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